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Finnair MD-11 Engine Question (Pic)  
User currently offlineAlitaliaMD11 From Spain, joined Dec 2003, 4068 posts, RR: 13
Posted (7 years 8 months 3 days 19 hours ago) and read 6348 times:

I took this photo today of OH-LGH on finals for 31R at JFK and it appears to me that the right engine has a longer nozzle then the left engine. The right engine looks like one of the engines on Air Europa's A330-200.

http://i126.photobucket.com/albums/p82/JanuaryJFK/finn.jpg


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Photo © Jeroen Hribar - AirTeamImages



Is it just an optical allusion or...?


No Vueling No Party
12 replies: All unread, jump to last
 
User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 1, posted (7 years 8 months 3 days 18 hours ago) and read 6299 times:

It's most certainly not the CF6-80E1 which UX uses on their A330s. It's just an MD-11 with CF6-80 engines that have the longer engine spike.

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Photo © Sam Chui
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Photo © Phil Broad

I can't be more specific though. Anyone know which of the CF6-80s used on the MD-11 has the longer engine spike and which the shorter one?


User currently offlineTheCheese From United States of America, joined Jun 2004, 209 posts, RR: 0
Reply 2, posted (7 years 8 months 3 days 18 hours ago) and read 6253 times:
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It's not an illusion, that one spike is shorter than the others.

Most likely, that particular engine was replaced by a spare they had on hand that doesn't have the longer spike on it.


User currently offlineFlyboy14295 From United States of America, joined May 2005, 80 posts, RR: 0
Reply 3, posted (7 years 8 months 3 days 18 hours ago) and read 6229 times:

I'm guessing at the next maint. check it will be replaced to match the other spike?


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User currently offlineSlimChance From United States of America, joined May 2006, 62 posts, RR: 0
Reply 4, posted (7 years 8 months 3 days 18 hours ago) and read 6213 times:

So what's the functional difference between the two?

User currently offlineTheCheese From United States of America, joined Jun 2004, 209 posts, RR: 0
Reply 5, posted (7 years 8 months 3 days 18 hours ago) and read 6199 times:
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Quoting SlimChance (Reply 4):
So what's the functional difference between the two?

Probably none.

I would hazard a guess that the one with the shorter spike is rated at the same thrust, though it may not have the exact same operating characteristics of the other two. Perhaps it is less fuel-efficient at the same thrust ratings.

I do not know for certain, ask in Tech/Ops for a definitive answer.


User currently offlineEFHK From Finland, joined Nov 2006, 392 posts, RR: 0
Reply 6, posted (7 years 8 months 3 days 17 hours ago) and read 6140 times:

Quoting AlitaliaMD11 (Thread starter):
I took this photo today of OH-LGH

Just a small correction, there is no OH-LGH in AY's fleet, this seems to be OH-LGF to my eyes.



One of the best places in the world: McDonald's in T2 at FRA.
User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 7, posted (7 years 8 months 3 days 17 hours ago) and read 6106 times:

Quoting EFHK (Reply 6):
Just a small correction, there is no OH-LGH in AY's fleet, this seems to be OH-LGF to my eyes.

Yup, that is OH-LGF, the same plane that was the Santa Claus logojet last year.


User currently offlineEFHK From Finland, joined Nov 2006, 392 posts, RR: 0
Reply 8, posted (7 years 8 months 3 days 14 hours ago) and read 5959 times:

Quoting LTU932 (Reply 7):
Yup, that is OH-LGF, the same plane that was the Santa Claus logojet last year.

Actually last year all MD-11s were Santa Claus logojets, this year only 3
MD-11s and the 1 A340-300.



One of the best places in the world: McDonald's in T2 at FRA.
User currently offlineAlitaliaMD11 From Spain, joined Dec 2003, 4068 posts, RR: 13
Reply 9, posted (7 years 8 months 3 days 8 hours ago) and read 5723 times:

Quoting LTU932 (Reply 1):
It's most certainly not the CF6-80E1 which UX uses on their A330s.

I knew that for sure, I was just reffering to the size of the length of the engine spike.

Quoting EFHK (Reply 6):
Just a small correction, there is no OH-LGH in AY's fleet, this seems to be OH-LGF to my eyes.

Sorry my bad, I got it right though when I uploaded the photo.

Thanks for clearing it up guys.



No Vueling No Party
User currently offlineQantas744ER From United States of America, joined Jun 2005, 1288 posts, RR: 4
Reply 10, posted (7 years 8 months 3 days 8 hours ago) and read 5713 times:

To clear things up, the longer engine "spikes" are just a newer type of nozzle that they started using for the A330 and then also on other CF6-80 engines for the MD11. Of course not many MD11's got delivered with this nozzle but if all three engines are replaced with new ones fro GE, they will all recieve the new type of nozzle CF6-80.

Cheers Leo



Happiness is V1 in Lagos
User currently offlineMD11Fanatic From United States of America, joined Oct 2006, 81 posts, RR: 0
Reply 11, posted (7 years 8 months 3 days 2 hours ago) and read 5611 times:

But can anyone tell me if there's any performance difference with this nozzle as opposed to the shorter one? I don't see why they'd invent a new one if the old one was blasting hot air fine too?

User currently offlineIFIXCF6 From United States of America, joined Sep 2004, 108 posts, RR: 0
Reply 12, posted (7 years 8 months 2 days 17 hours ago) and read 5532 times:

The performance difference is in economy of operation. The "spike", which is properly called an exhaust nozzle centerbody was lengthened to improve fuel burn. Remember the MD11 did not do as well as promised initially in this department, and part of the cause was GE not making their target. Hence a service bulletin when a better way has been found. But do you scrap expensive, albeit somewhat less effecient parts? Your CFO has answered...short and long centerbodies on the same A/C.

No CF6-80E is installed on anything other than an A330. It has a larger fan than a -80C2.

Mike


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